Up for sale is a Texas Instruments 1977 book titled \"Making Tracks into Programming - A step-by-step learning guide to the power,ease and fun of using your TI Programmable 57 along with a Texas Instruments 1976 book titled \"The Great INTERNATIONAL MATH ON KEYS BOOK\". The 2nd book was written for the TI-30 calculator but can be used for most calculators from that time period. TI 57 book is curled, model # and serial # written on the inside of front cover. Small stain on the back cover. Front and back covers of the Math on Keys book has some folds/creases and the back cover has a 2-1/2\" slice. No other issues with these 2 books.